using System;
using System.Collections;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Collections;

namespace Org.BouncyCastle.Asn1.CryptoPro
{
	/**
	* table of the available named parameters for GOST 3410-2001.
	*/
	public sealed class ECGost3410NamedCurves
	{
		private ECGost3410NamedCurves()
		{
		}

		internal static readonly IDictionary objIds = Platform.CreateHashtable();
		internal static readonly IDictionary parameters = Platform.CreateHashtable();
		internal static readonly IDictionary names = Platform.CreateHashtable();

		static ECGost3410NamedCurves()
		{
			BigInteger mod_p = new BigInteger("115792089237316195423570985008687907853269984665640564039457584007913129639319");
			BigInteger mod_q = new BigInteger("115792089237316195423570985008687907853073762908499243225378155805079068850323");

			FpCurve curve = new FpCurve(
				mod_p, // p
				new BigInteger("115792089237316195423570985008687907853269984665640564039457584007913129639316"), // a
				new BigInteger("166")); // b

			ECDomainParameters ecParams = new ECDomainParameters(
				curve,
				curve.CreatePoint(
					BigInteger.One, // x
					new BigInteger("64033881142927202683649881450433473985931760268884941288852745803908878638612"), // y
					false),
				mod_q);

			parameters[CryptoProObjectIdentifiers.GostR3410x2001CryptoProA] = ecParams;

			mod_p = new BigInteger("115792089237316195423570985008687907853269984665640564039457584007913129639319");
			mod_q = new BigInteger("115792089237316195423570985008687907853073762908499243225378155805079068850323");

			curve = new FpCurve(
				mod_p, // p
				new BigInteger("115792089237316195423570985008687907853269984665640564039457584007913129639316"),
				new BigInteger("166"));

			ecParams = new ECDomainParameters(
				curve,
				curve.CreatePoint(
					BigInteger.One, // x
					new BigInteger("64033881142927202683649881450433473985931760268884941288852745803908878638612"), // y
					false),
				mod_q);

			parameters[CryptoProObjectIdentifiers.GostR3410x2001CryptoProXchA] = ecParams;

			mod_p = new BigInteger("57896044618658097711785492504343953926634992332820282019728792003956564823193"); //p
			mod_q = new BigInteger("57896044618658097711785492504343953927102133160255826820068844496087732066703"); //q

			curve = new FpCurve(
				mod_p, // p
				new BigInteger("57896044618658097711785492504343953926634992332820282019728792003956564823190"), // a
				new BigInteger("28091019353058090096996979000309560759124368558014865957655842872397301267595")); // b

			ecParams = new ECDomainParameters(
				curve,
				curve.CreatePoint(
					BigInteger.One, // x
					new BigInteger("28792665814854611296992347458380284135028636778229113005756334730996303888124"), // y
					false),
				mod_q); // q

			parameters[CryptoProObjectIdentifiers.GostR3410x2001CryptoProB] = ecParams;

			mod_p = new BigInteger("70390085352083305199547718019018437841079516630045180471284346843705633502619");
			mod_q = new BigInteger("70390085352083305199547718019018437840920882647164081035322601458352298396601");

			curve = new FpCurve(
				mod_p, // p
				new BigInteger("70390085352083305199547718019018437841079516630045180471284346843705633502616"),
				new BigInteger("32858"));

			ecParams = new ECDomainParameters(
				curve,
				curve.CreatePoint(
					BigInteger.Zero, // x
					new BigInteger("29818893917731240733471273240314769927240550812383695689146495261604565990247"), // y
					false),
				mod_q);

			parameters[CryptoProObjectIdentifiers.GostR3410x2001CryptoProXchB] = ecParams;

			mod_p = new BigInteger("70390085352083305199547718019018437841079516630045180471284346843705633502619"); //p
			mod_q = new BigInteger("70390085352083305199547718019018437840920882647164081035322601458352298396601"); //q
			curve = new FpCurve(
				mod_p, // p
				new BigInteger("70390085352083305199547718019018437841079516630045180471284346843705633502616"), // a
				new BigInteger("32858")); // b

			ecParams = new ECDomainParameters(
				curve,
				curve.CreatePoint(
					BigInteger.Zero, // x
					new BigInteger("29818893917731240733471273240314769927240550812383695689146495261604565990247"), // y
					false),
				mod_q); // q

			parameters[CryptoProObjectIdentifiers.GostR3410x2001CryptoProC] = ecParams;

			objIds["GostR3410-2001-CryptoPro-A"] = CryptoProObjectIdentifiers.GostR3410x2001CryptoProA;
			objIds["GostR3410-2001-CryptoPro-B"] = CryptoProObjectIdentifiers.GostR3410x2001CryptoProB;
			objIds["GostR3410-2001-CryptoPro-C"] = CryptoProObjectIdentifiers.GostR3410x2001CryptoProC;
			objIds["GostR3410-2001-CryptoPro-XchA"] = CryptoProObjectIdentifiers.GostR3410x2001CryptoProXchA;
			objIds["GostR3410-2001-CryptoPro-XchB"] = CryptoProObjectIdentifiers.GostR3410x2001CryptoProXchB;

			names[CryptoProObjectIdentifiers.GostR3410x2001CryptoProA] = "GostR3410-2001-CryptoPro-A";
			names[CryptoProObjectIdentifiers.GostR3410x2001CryptoProB] = "GostR3410-2001-CryptoPro-B";
			names[CryptoProObjectIdentifiers.GostR3410x2001CryptoProC] = "GostR3410-2001-CryptoPro-C";
			names[CryptoProObjectIdentifiers.GostR3410x2001CryptoProXchA] = "GostR3410-2001-CryptoPro-XchA";
			names[CryptoProObjectIdentifiers.GostR3410x2001CryptoProXchB] = "GostR3410-2001-CryptoPro-XchB";
		}

		/**
		* return the ECDomainParameters object for the given OID, null if it
		* isn't present.
		*
		* @param oid an object identifier representing a named parameters, if present.
		*/
		public static ECDomainParameters GetByOid(
			DerObjectIdentifier oid)
		{
			return (ECDomainParameters) parameters[oid];
		}

		/**
		 * returns an enumeration containing the name strings for curves
		 * contained in this structure.
		 */
		public static IEnumerable Names
		{
			get { return new EnumerableProxy(objIds.Keys); }
		}

		public static ECDomainParameters GetByName(
			string name)
		{
			DerObjectIdentifier oid = (DerObjectIdentifier) objIds[name];

			if (oid != null)
			{
				return (ECDomainParameters) parameters[oid];
			}

			return null;
		}

		/**
		* return the named curve name represented by the given object identifier.
		*/
		public static string GetName(
			DerObjectIdentifier oid)
		{
			return (string) names[oid];
		}

		public static DerObjectIdentifier GetOid(
			string name)
		{
			return (DerObjectIdentifier) objIds[name];
		}
	}
}
